Automatic vent for breather roofs



AUTOMATIC VENT FOR BREATHER ROOFS Filed Dec. 23, 1927 W 2/5 (7 f 1' a dz,

Patented June 11, 1929.

UNITED STATES PFATENT or GLAYTON'L. DAY, 01' CHICAGO, ILLINOIS, ASSIGNOR TO CHICAGO BRIDGE & I30! 00., i

FICE.

I A CORPORATION OF ILLINOIS.

AUTOIATIC VENT FOB BBEATHEB ROOFS.

Application filed December 23, 1927. Serial Ito. 242,236.

This invention relates to improvements in automatic vents for breather roofs, and more especially to a vent for a. roofot' this kind used in connection with the storage of gases and volatile oils.

For example, containers for volatile OllS frequently are provided with mo\-' able roofs in order to permit changes in volume 1n the vapor space above the liquid. There 1s usually a limit to the range of movement 0t sucl1 roofs, and consequently means must be provided for venting the tank when the root reaches its maximunrheight. 1

One of the features of my invention is the provision of such automatic venting means for use in connection with roofs of this character which is simple and eflicient in operation and does away with mechanical Valves, and the like. D

Other features and advantages of my invention will appear more fully as I proceed with my specification.

I11 that form of device including the features of my inventionshown in the accompanying drawings, Flgure '1 1s a yertlcal sectlonal view showing my invention applied to a breather roof of the type having its edge permanently attached to the shell, the central portion of said roof adapted to move upwardly and downwardly, 2 1s a similar view showing the invention embodied in connection with the breather root ofthat type in which the entire roof moves bodily upwardly 'and downwardly, Fig. 3 is a View similar to Fig. 1 showing a modi- 'fied form, and Fig. 4 shows another modification.

In that form of device embodying the features of my invention shown in the accompanying drawings, 10' indicates the usual 0 lindrical shell or wallof the tank and 11 tile bottom, in the form shown in Fig. 1 the roof 12 is of the breather type with its outer edge 12 permanently attached to the upper edge of the shell 10. The central portion of the roof 12 is adapted to move upwardly and downwardly in accordance with variations in volume in the vapor space 13 above the liquid 14 .in the tank. The lowermost position ofthe roof 12 is shown by the solid lines and the uppermost position by the broken lines.

Obviousl when the roof 12 reaches its maximum eight as shown by the broken lines in Fig 1, thegas pressure mustbe the cup thus raised. means must vented. I provideautomatic means for doing this consisting of the cup 15 which may be mounted in any suitable manner, for example, on a post 16. with a suitable liquid 17 and the roof 12 carries a. vent pipe 18 with its upper end as indicated by 18 projecting'a sufficient distance above the roof 12 to give the desired internal maximum gas pressure. The lower end of the pipe 18 as indicated by 18 is immersed in the liquid 17 in the cup 15. The parts are so proportioned that when the roof 12 reaches its maximum height or the top of its breathing movement the lower end of the pipe 18 will be lifted out of the liquid in the cup thus losing the head of liquid in the pipe and pressure. p

In that form of device shown in Fig. 2, the breather roof is of a somewhat different type and is here shown as a conical roof 112 adapted to rise and fall bodily. A liquid seal is provided at the edge of the roof comprising the eup with the liquid 21, the roof being provided with a depending flange 22 with its lower edge immersed in'the liquid. The venting means is substantially the same and includes a cup 115 similar to the cup 15 with a vent pipe 118 similar to the vent pipe 18. The cup 115 is provided with liquid 117 and the lower end of the vent pipe 118 is immersed in this liquid. The parts are so proportioned that as the roof reaches its maximum height the end of the pipe 118 will be lifted out of the liquid to vent the pressure. v

The form .shown in Fig. 3 is substantially the same as that shown in Fig. 1 except that the cup 215 corresponding to the cup 15 is raised in order to permit a higher level of liquid in the tank. It will be seen that in the form shown in Fig. 1, the liquid in the tank cannot be-higher than the top of the cup 15. If it should be higher than this the The cup 15 is filled venting the internal out when the roof reaches its maximum,

height. In the form of means shown in Fig. 1. therefore, the liquid must never be higher than the cup 15. The means shown in Fig. 3 permits a higher level of liquid in the tank by raising the cup to a higher level. With be provided to permit the roof 212 to descend to its lowest position without striking the top of the cup. This is accomplished by providing the ing. In the orm shown in Fig. 3 there is 1 indicated a maximum llqllld overflow pipe The vent pipe, as indicated b 318, may be vertically adjustable by threa ing the same in the collar 319 on the roof 312.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modificatiops. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention disclosed in the appended claims, in which it is my intention to claim all novelty in my invention as broadly as possible in view of the prior art.

What I claim is new, and desire to secure by Letters Patent, is:

1. In combination-with a container having a breather roof of the character described; a stationary cup with a liquid; and a vent pipe carried by the roof and adapted to move up and down with the root' in its breathing movement, the upper end of said pipe open to the atmosphere and its lower end immersed in the liquid in the cup and adapted to be lifted out of said liquid upon the roof reaching substantially the top of its breathing movement.

2. In combination witha container having a breather roof of the character described; a. stationary cup with a liquid, the

top of said cup being substantially level Wiiillilllt} maximum oil level inthe container; a raised portion in the roof adapted to accommodate the cup in the lower posit-ions of the roof; and a vent pipe carried by the roof and adapted to move up and down with the roof in its breathing movement, the upper end of said pipe open to the atmosphere and its lower end immersed in the liquid in the cup and adapted to be lilted out of said liquid upon the roof reaching substantially the top of its breathing movement.

In combination with a container having a breather roof of the character described; a stationarycup with a liquid; and a vent pipe carried by the roof and adapted to move up and down with the roof in its breathing movement, the upper end of said pipe extending above the roof and open to the atmosphere and its lower end immersed in the liquid in the cup and adapted to be lifted out of said liquid upon the roof reaching substantially the top of its breathing movement.

.4. In combination with a container having a breather roof of the character described; a stationary cup with a liquid; a vent pipe carried by the roof and adapted to move up and down with the roof in its breathing movement, the upper endof said pipe open to the atmosphere and its lower end immersed in the liquid in the cup and adapted to be lifted out of said liquid upon the root reaching substantially the top of its breathing movement; and means for adjusting the vent pipe vertically with respect to the roof.

I witness whereof, I have hereunto set my hand this 12th December, 1927.

CLAYTON L. DAY. 

